Malicious PDF — malware analysis report

Static analysis result for SHA-256 f542a24eb8882c6a…

MALICIOUS

PDF

88.5 KB Created: 2021-09-04 04:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e55ac3cdf49e547f00052286004a85db SHA-1: f70b968d0eca868c23f3f47b2697346c5e3c9e6c SHA-256: f542a24eb8882c6a018150cb80bfb56893c2088f97a01812cbe8bfb9e1d4b51a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised WordPress sites and disposable hosting domains. The presence of a 'download button' heuristic suggests a lure to trick users into clicking these links, which likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/64bf83c3f5d1f7966ee96ba8a60d8090/77560181814.pdf In PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/relawod.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/epg8f5lptkdtr678padre9t5i2/lagogedoxoxorirutawiz.pdfIn PDF document text
    • http://airlineclassof66reunion.com/clients/c/cb/cb51827d251551eca15067b3b23580a4/File/9401101193.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/fonogujowozage.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/nikisurasufotizobepoju.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8989ec2ccc---sefaporu.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/munumezemikoleseve.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160790a8222a4f---99467807259.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f869d4d4b4---23702070888.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/jfh4v2nk2hj9p47dl49u773sms/doduzuvufedos.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/e3679acbb6b300f557c04c057ef1325f/tuvefom.pdfIn PDF document text
    • https://kaimano.it/file/91495834176.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/66976715156.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703585bb3c8---54115433551.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210823224601_yx0og6.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7adb7edeeb---30658031514.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/75808181933.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/76840654931.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c961f9287dc59938faf92cead842ae1a/36761244786.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/numalixusoxupajufifibu.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/92748157958.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/47519957568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bs+grewal+book+solution+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001068b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068B 18888 bytes
SHA-256: 975718d5cd97a014ff31a6746e3eb9270f5d40a9f0eb1bb51eb5374f7b862baa
font_02_sfnt_off0001387c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1387C 11144 bytes
SHA-256: 20f84efedbe0074e1a8462a9d46aaa1332bbe45c2cc5d5c90fd7e521ce483786

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